Question

A can complete 1/5 of a piece of work in 12 hours
and B can complete l/6 of the same work in
15 hours. In how many hours both working
together can complete the work?​

Answer 1

So A completes per hour of work=1/5 X 1/12=1/60.

B Completes per hour of work= 1/6 X 1/15= 1/90

Now say both working together take Z hour to complete the work,

Hence 1/60 X Z + 1/90 X Z= 1,

So, Z=36.

Therefore, both working together will complete the task in 36 hours.